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ALCHEMY Jurnal Penelitian Kimia
Published by Universitas Sebelas Maret
ISSN : 14124092     EISSN : 24434183     DOI : -
Core Subject : Science, Social, Engineering,
Chemical Engineering, Chemistry & Bioengineering Chemistry Energy Environmental Science Materials Science & Nanotechnology
ALCHEMY Jurnal Penelitian Kimia is a chemistry journal published by Sebelas Maret University, Surakarta. ALCHEMY Jurnal Penelitian Kimia publishes original research articles or review articles in organic chemistry, inorganic chemistry, analytical chemistry, physical chemistry, biochemistry, and environmental chemistry.
Arjuna Subject : -
Articles 264 Documents
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Antibacterial Activity Test of Extract Nyamplung (Calophyllum inophyllum Linn.) LeavesAntibacterial Activity Test of Extract Nyamplung (Calophyllum inophyllum Linn.) Leaves Mutiara Novianti; Qurrotul Aini; Irma Fadhila Putri
ALCHEMY Jurnal Penelitian Kimia Vol 11, No 2 (2015): September
Publisher : UNIVERSITAS SEBELAS MARET (UNS)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20961/alchemy.11.2.718.200-210

Abstract

Phytochemical screening and antibacterial activity from ethanol extract of nyamplung (Callophylum inophyllum Linn.) leaves from Indonesia against Escherichia coli has been done. The extraction was done by soklet extraction using ethanol. Antibacterial activity test using the Optical Density method at λmax 600 nm. The result of phytochemical screening from ethanol extract showed that there were flavonoid compounds, saponins, tannins, phenols and triterpenoids. The result of antibacterial activity test showed that the optimum activity occurs at incubation time of 3 hours with percentase inhibition persentase i.e. 59.03 %.
Sensing of Prostate Spesific Antigen by Differential Pulse Anodic Stripping Voltammetry of Gold Nanoparticle - Silver Enhanced Labels Rika Endara Safitri; Ani Mulyasuryani; Attasith Parnsubsakul; Patsamon Rijiravanich
ALCHEMY Jurnal Penelitian Kimia Vol 12, No 2 (2016): September
Publisher : UNIVERSITAS SEBELAS MARET (UNS)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20961/alchemy.12.2.1724.128-141

Abstract

Metode deteksi Antigen Spesifik Prostat (ASP) berdasarkan pemotongan peptide dengan menggunakan perak enhancer (AgEhn) pada nanopartikel emas (AuNP) sebagai penanda. ASP merupakan serin protease yang dihasilkan secara normal oleh sel jaringan prostat dan sel kanker prostat.ASP secara luas digunakan sebagai biomarker untuk kanker prostat.Aktivitas ASP dideteksi berdasarkan pemotongan peptida yang terikat pada dasar wellplate melalui interaksi biotin – avidin. Setelah proses pemotongan, peptida-SH yang terpotong akan terbuang dalam proses pembilasan, peptidayang terpotong pada dasar wellplate tidak dapat mengikat nanopartikel emas karena kehilangan gugus tiol (-SH) pada ujung peptida. Sisa peptide-SH yang tidak terpotong akan berikatan dengan AuNP, diikuti dengan reduksi secara autokatalitik pada larutan AgEhn menjadi Ag(s). Jumlah Ag yang terdapat pada permukaan AuNP ditentukan secara voltametri lucutan anodik (VLA) setelah mengoksidasi Ag (s) menjadi ion Ag+ menggunakan elektroda screen printed carbon (SPC). Optimasi dilakukan pada kondisi pengukuran dan kondisi immunoassay, sehingga penentuan PSA pada rentang 1–500 ng.mL-1 dihasilkan limit deteksi sebesar 152,204 ng.mL-1 dengan sensitivitas 0,003 μ A/ng.mL-1. Penentuan PSA dengan metode ini telah berhasil dilakukan, namun masih membutuhkan kajian lebih lanjut.
ANALYSIS OF MICROPOROSITY ON POROUS CARBON FROM GELATIN (KPG) USING N2 ADSORPTION-DESORPTION BY DUBININ–RADUSHKEVICH (D-R) MODEL Maria Ulfa
ALCHEMY Jurnal Penelitian Kimia Vol 13, No 1 (2017): March
Publisher : UNIVERSITAS SEBELAS MARET (UNS)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20961/alchemy.13.1.4070.103-118

Abstract

Porous gelatin carbons (KPG) sample with micropores were synthesized from gelatin via templating method. This study analyzed microporosity using the Dubinin– Radushkevich (D-R) equation. The result shows that KPG sample has microporous type with empirical parameter n=2 which describing the homogeneous degree of KPG with the high order of micropore filling. D-R plot shows that the increasing the ratio of gelatin to SBA-15 led to the decreasing the microporosity of samples. However, this increases the size and pore volume due to the success of templating process.The result of TEM shows the carbon particle aggregation and FTIR result shows that carbon particle were dominated by the functional group of oxygen and hydrocarbon. The energy of adsorption range of 5-10 kJ/mol and a value of n=2 demonstrated that the adsorption of nitrogen on the porous gelatin carbon (KPG) physically occurred which is applicable to the next gas adsorption process.
Isolation of Silica-Lignin Composites from Rice Husk and Their Adsorption to Cr(VI) Yati B. Yuliyati; Seli Listiani; Solihudin Solihudin; Atiek Rostika Noviyanti
ALCHEMY Jurnal Penelitian Kimia Vol 14, No 2 (2018): September
Publisher : UNIVERSITAS SEBELAS MARET (UNS)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20961/alchemy.14.2.19818.267-276

Abstract

Rice husk is the most abundant agricultural waste in Indonesia. It can be used as a precursor for multifunctional materials such as silica-lignin composite for adsorbents. Silica-lignin can reduce heavy metal content in an industrial waste, such as the content of Cr(VI). This study aims to isolate and characterize silica-lignin composite, and determines the isotherm type of silica-lignin for hexavalent chromium adsorption. The isolation from rice husk used an alkali extraction method. Confirmation of typical functional groups in the silica-lignin composite was characterized by FTIR, while the morphology was characterized by SEM, respectively. The results reveal that the silica-lignin isolation was successfully performed.  FTIR spectra indicate a typical wavenumber of the silica-lignin.  The SEM image of the composite showed homogeneous morphology. The silica-lignin adsorption process on hexavalent chromium followed a Brunauer–Emmett–Teller (BET) isotherm type indicated by multilayer adsorption with a surface area of 948.8421 mg. g-1.
Optimization of Rhodamine B Decolorization by Adsorption and Photoelectrodegradation Combination System Sayekti Wahyuningsih; Velina Anjani; Hanik Munawaroh; Candra Purnawan
ALCHEMY Jurnal Penelitian Kimia Vol 14, No 2 (2018): September
Publisher : UNIVERSITAS SEBELAS MARET (UNS)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20961/alchemy.14.2.16440.277-290

Abstract

A combination of adsorption and photoelectrodegradation system was performed to reduce the concentration of Rhodamine B dye in water. The adsorption was conducted using silica and alumina activated by acid and base under various predetermined pH of Rhodamine B. The photoelectrodegradation process was performed using Ti/TiO2 electrode as a cathode and Ti/TiO2-NiO as an anode. TiO2 was synthesized from titanium tetra-isopropoxide precursor (TTiP) by sol-gel method. TiO2-NiO composite was synthesized with the same precursor with the addition of Ni(NO3)2.6H2O. The result shows that the activation changes the amount of OH total in the adsorbent. The acid-activated adsorbent showed an optimum adsorption activity when Rhodamine B was in base condition caused by zwitter ionic structure. It reversely occured to base-activated adsorbent where an optimum absorption activity reached at acid condition. The application of base-activated silica in adsorption and photoelectrodegradation combination system decreased the concentration of Rhodamine B dye up to 98.79% using photoanode Ti/TiO2-NiO under pH 2 at bias potential 6 V.
Efek Komposisi Bioadsorben α-Keratin/Alginat Terhadap Kapasitas Adsorpsi Logam Berat Besi (Fe) Elsa Ninda Karlinda Putri; Syahna Febrianastuti; Easy Vicky Maylinda; Ganjar Fadillah; Candra Purnawan
ALCHEMY Jurnal Penelitian Kimia Vol 14, No 2 (2018): September
Publisher : UNIVERSITAS SEBELAS MARET (UNS)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20961/alchemy.14.2.11410.323-333

Abstract

Penelitian terkait pengaruh komposisi α-keratin/alginat terhadap kapasitas adsorpsi logam berat besi (Fe) telah dilakukan. Penelitian ini bertujuan untuk mengetahui karakter dan optimasi adsorpsi dari bioadsroben komposit α-keratin/alginat terhadap daya serap logam berat Fe dalam larutan air. Proses preparasi bioadsorben α-keratin/alginat dilakukan dengan metode enkapsulasi pada larutan CaCl2 2% (b/v). Karakterisasi bioadsorben dilakukan menggunakan Fourier Transform Infra-Red (FTIR), Scanning Electron Microscopy (SEM) dan proses adsorbsi dilakukan dengan metode batch. Hasil karakterisasi IR pada komposit α-keratin/alginat menunjukkan terdapatnya serapan pada bilangan gelombang 1140-820,75 cm-1 yang merupakan reduksi gugus mannuronate dari alginat. Hal ini menunjukan bahwa alginat telah terikat secara kimia dengan α-keratin. Adsorpsi logam Fe (3 ppm) dalam larutan dilakukan dengan variasi komposisi α-keratin:alginat secara berturut-turut sebagai berikut 1:1; 1:2; 1:3; 2:1 dan 3:1 (b/b). Hasil pengukuran menggunakan Atomic Absorption Spectroscopy (AAS) dengan metode kurva kalibrasi standar menunjukkan komposisi optimum penyerapan logam Fe (3 ppm) adalah 1:2 dengan kapasitas adsorpsi sebesar 205,64 mg/g. Hasil karakterisasi SEM pada komposit α-keratin:alginat komposisi 1:2 (b/b) yang memberikan kemampuan adsorpsi yang terbesar menunjukkan bahwa permukaan rambut manusia tidak tertutup secara menyeluruh sehingga gugus aktif dan celah-celah kecil pada komposit dapat berperan dalam proses adsorpsi logam berat besi (Fe).The Effect of α-Keratin/Alginate Bioadsorbent Composition on the Adsorption Capacity of Heavy Metal of Iron (Fe). A study of the influence of α-keratin-alginate composition on the heavy metal adsorption of Fe has been performed. The research aims to determinate the character and adsorption optimation of α-keratin/alginate composite for Fe adsorption in aqueous solution. The preparation α-keratin/alginate composite was conducted by encapsulation method in CaCl2 2% solution. The characterization of bioadsorbent was performed by Fourier Transform Infra-Red (FTIR), Scanning Electron Microscopy (SEM) and adsorption process was conducted by batch method. The FTIR result on α-keratin/alginate shows that adsorption at wavenumber of 1140-820.75 cm-1 which indicates the reduction of mannuronate group from alginate. This suggests that alginate was chemically bound with α-keratin. The adsorption of Fe (3 ppm) in the solution was carried out with variation of composition α-keratin:alginate of 1:1; 1:2; 1:3; 2:1; and 3:1 (w/w). The measurement using AAS (atomic absorption spectroscopy) with standar calibration curve method showed that optimum composition of Fe (3 ppm) adsorption was 1:2 (w/w) with adsorption capacity of 205.64 mg/g.  The SEM result on α-keratin/alginate 1:2 (w/w) which had the greatest adsorption capability shows that the surface of human hair was not completely closed thus the active groups and pores can play a role in the process of adsorption of heavy metal iron (Fe).
Pemantapan Proses Sintesis Ligan Dibutilditiokarbamat (DBDTK) Sebagai Pengekstrak Logam Tanah Jarang Berdasarkan Desain Eksperimen Diana Hendrati; Erianti Siska Purnamasari; Syulastri Effendi; Santhy Wyantuti
ALCHEMY Jurnal Penelitian Kimia Vol 14, No 2 (2018): September
Publisher : UNIVERSITAS SEBELAS MARET (UNS)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20961/alchemy.14.2.15006.219-235

Abstract

Gadolinium (Gd) merupakan salah satu logam tanah jarang, dimana logam tanah jarang dapat diekstrak dari mineral salah satunya mineral monasit. Logam Gd biasanya digunakan sebagai bahan dasar contrast agent dalam dunia kesehatan. Ligan dibutilditiokarbamat mampu membentuk senyawa kompleks dengan cara mengikat logam sehingga membentuk khelat yang dapat digunakan untuk ekstraksi. Tujuan dari penelitian ini adalah memantapkan sintesis ligan dibutilditiokarbamat berdasarkan desain eksperimen dan karakterisasi kompleks antara Gd(III) dengan ligan dibutilditiokarbamat hasil sintesis. Penelitian ini diawali dengan pembuatan desain eksperimen untuk sintesis ligan dan ekstraksi Gd(III) dengan ligan, kemudian proses sintesis dan ekstraksi dilakukan sesuai dengan desain eksperimen, hasil sintesis dan ekstraksi dikarakterisasi menggunakan metode spektroskopi serta diuji kelarutannya dalam pelarut organik. Data yang diperoleh menunjukkan bahwa sintesis ligan dibutilditiokarbamat optimal pada suhu 4 °C, perbandingan dibutilamin dan karbondisulfida yaitu 1 : 3 dengan perbandingan mol ammonia terhadap dibutilamin yaitu 1 : 4, sedangkan kondisi optimal untuk ekstraksi Gd(III) dengan ligan yaitu pada pH 6, dengan perbandingan mol Gd(III) dan ligan yaitu 1 : 4 dan lama ekstraksi 60 menit. Oleh karena itu ligan dibutilditiokarbamat hasil sintesis berpotensi digunakan sebagai ekstraktan untuk ekstraksi Gd(III). Hasil prediksi ligan berdasarkan desain eksperimen yaitu sebesar 56,12% sedangkan prediksi ekstraksi Gd(III) dengan ligan hasil sintesis diperoleh sebesar 78,41%.The Consolidation of Dibutyldithiocarbamate (DBDTC) Synthesis as Gadolinium Metal Extraction Based On Experimental Design. Gadolinium (Gd) is one of the rare-earth elements, whereas rare-earth elements can be extracted from monazite. Gd is usually used as raw material for synthesizing contrast agent in medicine field. Dibuthyldithiocarbamate ligand can form a complex compound with metal. This ligand will bind a metal and then forming chelate which is used for extraction. The purpose of this research is to ensure procedure of dibuthyldithiocarbamate ligand synthesis based on the design of experiment and to study the characterization of reaction result between Gd(III) and dibuthyldithiocarbamate ligand which this ligand is synthesis result. This research begins with making design of experiment for ligand synthesis and Gd(III) extraction with ligand, then perform the process of synthesis and extraction according to the design of experiment, the result of synthesis and extraction were characterized by spectroscopy method and solubility tested in organic solvent. The data was collected indicate that the optimal condition of dibuthyldithiocarbamate ligan synthesis at 4 °C (temperature), the ratio of di-n-butylamine and carbon disulphide is 1:3 with the mole ratio of ammonia to the di-n-butylamine 1:4, while the optimal conditions for gadolinium extraction with ligand at pH 6, the mol ratio of gadolinium and ligand is 1:4 and 60 minutes extraction time. Hence, dibuthyldithiocarbamate ligand can be used as extractan for extracting Gd(III). The prediction of ligand based on the experimental design is 56.12% while the prediction of Gd(III) extraction with ligand of the synthesis result is obtained equal to 78.41%. The conclusion of this research is that the synthesis of dibuthyldithiocarbamate ligand based on the experimental design can be developed for large-scale synthesis.
Pengaruh Jumlah Mol Kroslinker Pada Selektifitas IIP Berbasis Polieugenol Terhadap Fe(III) Muhammad Cholid Djunaidi; Abdul Haris; Pardoyo Pardoyo; Rosdiana K
ALCHEMY Jurnal Penelitian Kimia Vol 14, No 2 (2018): September
Publisher : UNIVERSITAS SEBELAS MARET (UNS)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20961/alchemy.14.2.12426.291-302

Abstract

Sintesis Ionic Imprinted Polymer (IIP) dilakukan dengan variasi penambahan crosslinker PEGDE (Polyethylene glycol diglycidilether) yang kemudian diuji selektivitas IIP terhadap ion logam Fe melalui proses adsorpsi. IIP merupakan metode mencetak ion logam yang terikat dalam polimer, selanjutnya dilepaskan dari matriks polimer menghasilkan cetakan yang sesuai terhadap ion target. Tujuan penelitian ini untuk menghasilkan IIP dan NIP dari polieugenol dengan variasi penambahan crosslinker PEGDE perbandingan sebanyak  1, 2 dan 3 mol, mengetahui pengaruh jumlah mol crosslinker terhadap selektivitas adsorpsi IIP yang melibatkan rongga imprint/cetakan, serta mengetahui pengaruh logam kompetitor terhadap selektivitas adsorpsi IIP terhadap logam Fe. Selektivitas adsorpsi ion logam Fe(III) dengan penambahan crosslinker PEDGE 3 mol lebih besar dibandingkan dengan penambahan crosslinker PEGDE 1 dan 2 mol. Selektivitas adsorpsi Fe lebih besar pada Fe-Cr dibandingkan dengan Fe-Cd dan Fe-Pb.Influence of Crosslinker Mole Amount on the Selectivity IIP-Based Polyeugenol Towards Fe(III). The synthesis of IIP (Ionic Imprinted Polymer) was carried out using PEGDE (Polyethylene glycol diglycidilether) crosslinker addition in various moles which was then tested for IIP selectivity for Fe metal ions through the adsorption process. IIP is a method of metal ions printing which are bound in a polymer, then released from the polymer matrix to produce a suitable mold for the target ion. The purposes of this study were to produce IIP and non imprinted polymer (NIP) from polyeugenol with the addition of various moles of PEGDE crosslinkers as much as 1, 2 and 3 moles, and to determine the effect of the number of mole crosslinkers on the selectivity of IIP adsorption involving imprint/mold cavities, and the effect of competitor metals on IIP adsorption selectivity towards Fe metal. The selectivity of Fe (III) metal ion adsorption with the addition of 3 mole PEDGE crosslinkers was greater than the addition of 1 and 2 moles PEGDE crosslinkers. The selectivity of Fe adsorption is was greater in Fe-Cr compared to Fe-Cd and Fe-Pb.
Sintesis dan Karakterisasi Silika Abu Ampas Tebu Termodifikasi Arginin sebagai Adsorben Ion Logam Cu(II) Candra Purnawan; Tri Martini; Ima Puspita Rini
ALCHEMY Jurnal Penelitian Kimia Vol 14, No 2 (2018): September
Publisher : UNIVERSITAS SEBELAS MARET (UNS)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20961/alchemy.14.2.19512.334-349

Abstract

Telah dilakukan penelitian tentang sintesis dan karakterisasi silika dari abu ampas tebu termodifikasi arginin dengan senyawa penggandeng glisidoksipropiltrimetoksisilan (GPTMS) sebagai adsorben ion logam Cu(II). Penelitian ini bertujuan untuk mengetahui karakterisasi silika abu ampas tebu termodifikasi arginin dengan senyawa penggandeng GPTMS sebagai adsorben ion logam Cu(II). Sintesis silika termodifikasi arginin dengan senyawa penggandeng GPTMS dilakukan dengan metode sol-gel. Adsorben tersebut dikarakterisasi dengan XRD, FTIR dan SAA. Uji kemampuan adsorpsi dilakukan menggunakan metode batch dengan larutan ion logam Cu(II), variasi pH, waktu kontak dan konsentrasi. Hasil penelitian menunjukkan perubahan difraktogram XRD pada silika termodifikasi dan silika abu ampas tebu (silika AAT). Difraktogram menunjukkan puncak melebar pada 2θ sebesar 10-15° dan 20-25°. Analisis FTIR menunjukkan Serapan baru –CH, ̶ NH tekuk, ̶ CN berturut-turut pada daerah 2947, 1570, dan 1356 cm-1. Analisis SAA menunjukkan peningkatan luas permukaan pada silika termodifikasi arginin daripada silika dari 64,31 m2/g menjadi 382,67 m2/g. Kondisi terbaik adsorpsi ion logam Cu(II) dengan adsorben silika termodifikasi arginin terjadi pada pH 6 dengan waktu kontak 45 menit. Silika termodifikasi arginin mengalami peningkatan kapasitas adsorpsi dibandingkan silika dengan kapasitas adsorpsi yaitu dari 0,12 mg/g menjadi 0,52 mg/g. Isoterm adsorpsi ion logam Cu(II) lebih dominan mengikuti isoterm Langmuir dengan r = 0,997.Synthesis and Characterization of Arginine-Modified Silica from Baggase Ash as Cu(II) Ions Adsorbent. The synthesis and characterization of arginine modified silica from bagasse ash with crosslinker glycydoxypropyltrimethoxyxylane (GPTMS) as an adsorbent for Cu (II) ions has been studied. This research aimed to determine the characterization of arginine modified silica with crosslinker GPTMS as an adsorbent for Cu(II) ions. Synthesis arginine modified silica with crosslinker GPTMS was conducted using sol-gel method. The adsorbent was characterized by XRD, FTIR and SAA. Adsorption ability test conducted using the batch method with a solution of Cu(II) ions, variation of pH, contact time and concentration. The results showed the change in the XRD diffractogram of arginine modified silica from bagasse (silica ATT). XRD diffractogram releaved broad peaks at 2θ 10-15° and 20-25°. FTIR analysis showed a new absorption -CH, -NH bending, -C-N on area of 2947, 1570, and 1356 cm-1, respectively SAA analysis showed that the arginine-modified silica with crosslinker GPTMS has higher surface area than silica from 64.31 m2/g to 382.67 m2/g. The best conditions for copper adsorption with adsorbent arginine modified silica occured at pH 6 with a contact time of 45 minutes. Arginine modified silica has higher adsorption capacity than silica with a adsorption capacity from 0.12 mg/g to 0.52 mg/g. Adsorption of Cu (II) metal ions more dominantly follows Langmuir isotherms with r = 0.997. 
Analisis Transisi Fasa dan Sifat Dielektrik Pada Li2CoSiO4 yang Dipreparasi dari Silika Sekam Padi dan Produk Daur Ulang Katoda Baterai Ion Litium Bekas Agus Riyanto; Simon Sembiring; Megawati Megawati; Ni’matil Mabarroh; Junaidi Junaidi; Ediman Ginting
ALCHEMY Jurnal Penelitian Kimia Vol 15, No 1 (2019): March
Publisher : UNIVERSITAS SEBELAS MARET (UNS)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20961/alchemy.15.1.24622.89-103

Abstract

Studi ini mendeskripsikan analisis transisi fasa dan sifat dielektrik pada bahan litium kobalt silikat (Li2CoSiO4) yang dipreparasi dari silika sekam padi dan produk daur ulang katoda baterai ion litium bekas dengan perbandingan massa 1:1. Transisi fasa pada sampel Li2CoSiO4 dipelajari menggunakan teknik termogravimetry/differential thermal analysis (TG/DTA). Sedangkan, nilai konstanta dielektrik pada sampel yang telah disinter pada suhu 600 – 900 oC dikarakterisasi menggunakan inductance, capacitance, dan resistance (LCR) meter. Hasilnya, pada rentang suhu 410 – 850 oC terjadi transisi polimorfik fasa  menjadi fasa . Suhu 850 oC juga merupakan titik transisi dimana fasa  berubah menjadi fasa . Transisi fasa yang terjadi pada sampel  Li2CoSiO4 diikuti dengan peningkatan nilai konstanta dielektrik dalam rentang frekuensi 450 – 100.000 Hz.Analysis of Phase Transition and Dielectric Properties of Li2CoSiO4 Prepared from Rice Husk Silica and The Recycling Product of Used Lithium Ion Batteries Cathode. This study describes the analysis of the phase transition and dielectric properties of lithium cobalt silicate (Li2CoSiO4) prepared from rice husk silica and the recycling product of used lithium ion batteries cathode with mass ratio of 1:1. Phase transition in Li2CoSiO4 sample was studied using thermogravimetry/differential thermal analysis (TG/DTA) techniques. Meanwhile, the dielectric constant value in the samples sintered at temperature of 600 – 900 oC were characterized using inductance, capacitance, and resistance (LCR) meter. As a result, a polymorphic transition from  phase to  phase was occured in the temperature range of 410 ­– 850 oC. Temperature of 850 oC is a transition point from  phase to  phase. The phase transitions occured in the Li2CoSiO4 was followed by the increasing of the dielectric constant in the frequency range of 450 – 100,000 Hz.

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